Power take-off unit



March 3, 1942. F. H. BEHL POWER TAKE-OFF UNIT Filed 0G13. 22, 1940 2 Sheets-Sheet l March 3, 1942. F. H. BEHL POWER TAKE-OFF UNIT 2 Sheets-Sheet 2 F'iled Oct. 22, 1940 Patented Mar. 3, 12942 4UNITED STATES PATENT oFricE 2,275,003 POWER TAKE-OFF UNIT Fred H. Bem, Milan, Minn. y Application October 22, 1940, Serial No. 362,294

l Claim.

a power take oit unit may he delivered from This invention relates to by means of which power a conventional power take on of a tractor to the drive shaft of a machine to be operated.

One object of the invention is to provide a power taire oii unit having an improved gearing by means of which rotary motion is transmitted from one shaft of the unit to another while at the same time allowing one section of the unit to he swung to singularly adjusted positions relative to the other section.

Another object of the invention is to so forni a large gear that when a lubricant such as grease manner from a single source of lubricant.

Another object of the invention is to provide an improved coupling for connecting the drive Y shaft of the power take off device with the power take oi shaft of a tractor and allow slippage under excessive strain and thus prevent elements of the power take off unit from being broken by excessive strain.

Another object of the a power take ofi unit which is simple in construction and very strong and durable.

The invention is illustrated in the accompanying drawings, wherein invention is to provide Figure 1 is a view showing the improved power take off unit principally in side partially in section.

Figure 2 is a view taken along the line 2 2 of Figure 1 and looking down upon the base of the unit.

Figure 3 is an enlarged view of the connection between the power take oif unit and the machine to be operated.

elevation and shaft ofa tractor.

. Figure 5 is asectional viewftalreny longitudinally through Figure 4.

y' by the drive shaft 8. It will thus n between the arms the double gear inner end portions the arms of the two sections and carry beveled pinions i2 which mesh with the upper and lower teeth I 3 and ifi of a large double beveled gear i5 firmly held by the spout 2i oi a vgrease cup 22 which passes through lthe hood and through the upper ar This grease cup is located directly over the pinion t2 carried by the is discharged from the pinion. As the pinion turns, the grease or oil is deposited upon the upper teeth it of the large gear then ows through the perforations iii to the lower teeth M and also is deposited upon the gear i2 carried he seen that oil or grease delivered from the single grease cup may lubricate the two pinions and also the large double gear.

An auxiliary section 23 is disposed rearwardly of the rear section 9 and carries arms or forks 24 which extend forwardly from the auxiliary section and have their forward ends pivotally connected with the arms 25 of the rear section by screws or bolts 26. A bearing 21 is mounted 24 where it is secured by screws 28 and through this bearing extends a sleeve 29 having a head 30 at its front end. This head is formed with arms 3i pivoted to a block t3 and the rear shaft i i is also provided at its vequivalent member l1 of a tractor.

power take off beyond the wall or rear end with a head 33 formed with arms pivotedto the block at right angles to the pivotal connection between the blockl and the arms 3|. It will thus' be seen that there has been provided-a universal joint connection between lthe in the similarly shapedbore of the sleeve 219 itv will be turned with the sleeve. Ihis shaft is of appreciably greater length than the auxiliary section 23 and at its rear end carries a coupler 3l by means of which it is to be connected with the `drive shaft of a machine to be operated. Since the shaft 35 is slidable through the auxiliary section 23, it may be longitudinally adjusted to accommodate itself to the position of a machine back of a tractor. The member 38 constitutes means for connecting the machine to be operated back of a tractor, and referring to Figure 1 it will be seen that movably connected with a draw bar 39 by means of a pin or bolt 40. The draw bar is of U-shaped formation, as shown in Figure 2, and constitutes a'base'for the forward member I of the power take off unitywhich is supported above it by rods or bolts Il. These rods or bolts, which may be referred to as supporting legs for the ,body t of the forward section, extend vertically through selected ones of the openings 42 formed in side arms of the draw bar 39 where they are secured by nuts.43 and the upper ends of the bolts or rods pass through feet 44 extending from opposite sides of the body portion 6 where they are secured by nuts 45. By this arrangement the power take oli unit may be adjusted longitudinally of the draw bar, and, by properly adjusting the nuts 45, the unit may be shifted vertically and secured in a set position. The draw bar 39 has its feet 46 secured upon a main draw bar or other portion 41 of a tractor by bolts 48 'which may be U-bolts if so desired, and it will thus be seen that the nent base for the power take off unit which is detachably connected with the draw bar or When the unit is not in use a machine to be drawn forwardly by the tractor may be connectedthereto injany conventional manner.

When this power take off unit is in use it is to be connected with the power take off shaft of a tractor or other towing vehicle and in order to do so there hasbeen provided a coupling, indicated in general by thel numeral 49. This coupling is constructed as shownfin detail in Figures 4, and 6 and has a cup-shaped casing 5B1 which this member 3B is pivotally and re- Wardly to an inoperative positionpermtting the sleeve to be-turned about the casing to an adjusted positionand then again `securedbythe latch. The short tubular neck 59 extends inwardly from the head 52 and through this neck passes the tubular shank 50 of a clutch member 9|. This clutch member has its shank Sil-formed with internal ribs for engagement with the external ribs 62 of the shaft 8 so that the shank may have longitudinal movement upon the shaft but at the same time cause the shaft to turn with it. The companion clutch member 53 is formed with a neck ,64 which passes through the center of the clutch member 6I and terminates in a spherical head 65 which is received in the forward portion of the tubular shank 50, and referring to Figure 5 it will be seen that the clutch member 6I is yieldably held in gripping engagement with the clutch member 53 by a spring" which is housed in the casing 53 with its rear portion disposed about the neck ing, the tension of the spring may be controlled and the ease with which slippage may take place between the clutch members controlled. The. i

shank 51 of the clutch member 63 is formed with ribs which engage companion ribs formed within its head 31 connected with the `driving shaft of is externally threaded to receive a sleeve or cap wall 52. The sleeve projects head 52 and carries a latch or keeper 53 which is pivotally mounted through the projecting portion of the sleeve, as shown at 54, and is formed with a longitudinally extending slot 55 to accommodate the lugs 55 and 57| which project laterally from the sleeve and the cupshaped casing. When the latch or keeper is swung to the position shown, the sleeve will be prevented from turning upon the cup-shaped casing, but when the pin or equivalent fastener 58 is removed, the latch may be swung out- 5I having an end a machine to be operated. The machine will be towed back of the tractor or remain stationary back of a tractor in a standing position. Rotary motion is transmitted from the power take off shaft of the tractor through the coupler 49 to the shaft 8 of the power take off unit and transmitted from this shaft to the shaft II through the medium of the double gear I5 and the pinions I2. Under normal conditions, the teeth of the two coupler members 5I and 53 remain in engagement so that the rotaryl motion will be transmitted to the shaft 8. If, however, operation of the machine back of the tractor is suddenly stopped by jamminglor the like, the teeth of ,the coupler member 63 nmay slide over the teeth of the coupler member 6I and mechanism of the machine to be operated will not be damaged.

Having thus described the invention, what is an auxiliary shaft rotatably' mounted through the rear casing section with its forward. portion slidably engaged in the sleeve and held against rotation therein, the rear portion of the rear shaft being adapted for connection with the drive shaft of machinery to be operated from the power take off unit.

FRED H. BEHL.

59 of the cap or i sleeve 50. By adjusting the sleeve upon the cas-- 

